- Filtered water enters cooling tank and gets pumped back out to tank. Flow rate to be adjusted to maintain water level. Limit switch inside sealed tank will control pump and filter via Arduino in case of accidental overflow. Systems connected to UPS in case of power failure.
I may be confused, that happens alot these days. If the holding tank is sealed, how can you get an accidental overflow? The canister filter (mechanical filtration) needs to be on to chill the water, correct? So when you dump a bunch of amphipods into the tank, your mechanical filter may be running and may suck up the amphipods. Is this what you want?
If sucking up the amphipods is an issue, can I offer a idea.
Seperate the canister filter, worry about this later. Build an overflow box but instead of a weir, put foam inside the overflow box to prevent sucking up those cute little amphipods into the sealed holding tank. Since the holding tank is sealed, the top level of the overflow box can be slight below the minimum water line. So when the chiller starts up, Crusty, the cute little amphipod gets suck into the foam filter pad but he still alive, just stuck. When the chiller turns off, Crusty can swim away and is quickly swallowed up by Fermat.
Edit: this would require a Herbie type plumbing system.
Now instead of an overflow box, you could just use valves. But you are talking to a person forgot to turn the water off during a water change and spilled ~20 gallons in my attic (3rd floor) fish room. So for water changes, just drain the holding tank, the overflow box will stop the flow of water into the holding tank.
Are you adding bio balls inside the holding tank?
Mark
